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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

What should I do, should I just force the computer to shut down by pressing the starting button for 5 seconds, and then restart my computer?
I'm waiting for your instructions, I'm completely blocked and I can't work, please help me as soon as possible. Thanks a lot.

so i just forced to reboot, and then I got this :
filesystem checks are in progress
press esc to cancel checks

and then I get again
init: mountall main process (1024) terminated with status 3.
and
mount of filesystem failed.
a maintenance shell will now be started.
CONTROL-D will terminate this shell and re-try.
root@elishac:^#
what should I do?

I made this mistake to shutdown my computer the wrong way too,and i could not boot it,till i formatted disk and reinstalled the operating system.I don't tell you to do that,there maybe be an other solution too.

I did not select anything, I told you everything that appeared on the screeen.
I wrote fsck and the answer was :
fscl from util-linux-ng 2.16
e2fsck 1.41.9 (22 aug 09)
dev/sda5 contains a file system with errors, check forced.
pass1:checking inodes,blocks, and sizes.
pass2:checking directory structure
pass3:checking directory connectviity
pass4:checking reference counts
untattached inode 1436210
connect to /lost+found<y>?

I wrote reboot and rebooted.
I chose ubuntu at grub.
then a screen appears that says :
one or more of the mounts listed in /etc/fstab cannot yet be mounted:
swap: waiting for UUID=c91... (a list of random chacaters)
press esc to enter recovery shell
shall i press esc?

Well actually I press esc but it didn't send me to a command line window. Instead, I get the normal graphical log in window.
I can now log in normally.
does that mean my problem is solved, even though i got the "one or more of the mounts listed in /etc/fstab cannot yet be mounted" message ?